[Jroush12]

So I just picked up a 2016 CCLB diesel and after bringing it home its started having a shudder when shifting at low RPM. I've read some have been able to fix this issue with a fluid swap, and others say the torque converter needs replaced but all these threads are relatively old. Has there been anything recent that states which route I should try first?

 

[SFLTruck]

Congrats on the Truck and welcome.

Replace the fluid first as it's way cheaper.

Use the Mobile1 HP LV BLUE label fluid as that's what GM has been using on both the 8 speeds and the 6L50's as well. If this doesn't solve your problem then it's most likely time for a torque converter. The thing is don't wait to long as the shutter is abusing the lock-up clutch and friction surface. The longer you let it slip the more it will damage the surfaces and consequently the more the probability a replacement TC will be needed.

https://www.amazon.com/Mobil-124715-Synthetic-Quart-Bottles/dp/B07Q3H159N

Lets us know how you make out, Good Luck
Shop the price, I see if moving regularly from mid $40 all the way up to $60 a case.

 

[SFLTruck]

Oops!

Performance Automotive Parts from Accel Billet Edelbrock MSD VDO. JEGS is the source for performance parts with Same Day Shipping.

www.jegs.com

 

[terryjm1]

Awesome! I just purchased 12 quarts of the trans fluid and 12 quarts of the Mobil 1 gear oil to change the diff oil. I will be changing the trans, transfer case, and front and rear diff oil out. The extra diff oil will go in another one of my vehicles and I added a quart of redline mtl for my old Land Rover gearbox. That got me to the $150 free shipping point.

 

[Jroush12]

Oops!

Performance Automotive Parts from Accel Billet Edelbrock MSD VDO. JEGS is the source for performance parts with Same Day Shipping.

www.jegs.com

View attachment 9029

Thanks for the link. I'll swap the fluid and see where that gets me and let y'all know how it goes.

 

[SFLTruck]

Awesome! I just purchased 12 quarts of the trans fluid and 12 quarts of the Mobil 1 gear oil to change the diff oil. I will be changing the trans, transfer case, and front and rear diff oil out. The extra diff oil will go in another one of my vehicles and I added a quart of redline mtl for my old Land Rover gearbox. That got me to the $150 free shipping point.

Make sure the gear oil does not have any friction modifiers if you have the Eaton G-80 rear locking differential. If you have the G-80 is will stop it from locking up properly.

 

[aplqst1]

Oops!

Performance Automotive Parts from Accel Billet Edelbrock MSD VDO. JEGS is the source for performance parts with Same Day Shipping.

www.jegs.com

View attachment 9029

thanks for the link, just purchased 12 qts myself. I have 2 local stores and neither had in stock.
so they ordered it for me with free shipping to my house... gotta love Jegs..

 

[terryjm1]

thanks for the link, just purchased 12 qts myself. I have 2 local stores and neither had in stock.
so they ordered it for me with free shipping to my house... gotta love Jegs..

Mine won’t ship until the 22nd. Seems as if the sale is going well.

 

[snowmanwoody]

So I just picked up a 2016 CCLB diesel and after bringing it home its started having a shudder when shifting at low RPM. I've read some have been able to fix this issue with a fluid swap, and others say the torque converter needs replaced but all these threads are relatively old. Has there been anything recent that states which route I should try first?

Fluid fixed mine

 

[Devan coss]

So I just picked up a 2016 CCLB diesel and after bringing it home its started having a shudder when shifting at low RPM. I've read some have been able to fix this issue with a fluid swap, and others say the torque converter needs replaced but all these threads are relatively old. Has there been anything recent that states which route I should try first?

I have had a shudder in mine since like 60000 miles I have 120000 on it now I figure I’ll drive it till the tranny quits then replace the tranny

 

[Florida beachbum]

So I just picked up a 2016 CCLB diesel and after bringing it home its started having a shudder when shifting at low RPM. I've read some have been able to fix this issue with a fluid swap, and others say the torque converter needs replaced but all these threads are relatively old. Has there been anything recent that states which route I should try first?

I had that problem also but it was with a 2018 gas engine with the eight speed transmission. At 1000 miles they did a triple flush on the transmission that took care of it till 15,000 miles when it started vibrating again. This time they said it needed a torque converter. I went to another dealership and traded it for a 2019 Zr2 with the diesel and a 6 speed transmission and haven’t had a single issue.

 

[Jroush12]

So update time: I had a bit of free time this week and the shudder had gotten worse before I flushed the transmission so I took it to the dealer. They (luckily) were really quick and are replacing the torque converter this week. I plan to run a better fluid (like the Mobil 1 HP) in the future, does anyone else have tips on how to prevent needing another torque converter In the future?

 

[SFLTruck]

Did the dealer do a fluid flush with the converter replacement ? If not I would do it with the (blue label, mobile HP LV fluid) right away because that's been the part of the root cause of the issue. If you feel it start shuttering keep it from doing it by changing throttle position and get it back to the dealer ASAP. The longer it shutters the more it beats up on the friction surfaces in the TC.

 

[Jroush12]

They drained the transmission but when they refilled it they just used their standard ATF. I plan on flushing it and using the Mobil 1 black label shortly.

 

[SFLTruck]

They drained the transmission but when they refilled it they just used their standard ATF. I plan on flushing it and using the Mobil 1 black label shortly.

The mobile blue label is what they are using now. They started with the black label and abandoned it for the blue because the black label wasn't resolving the issue.